I'm a rising senior at a boarding school. Before summer, for a lot of complicated sad reasons, I was singled out from my old friend group, and I haven't talked to them ever since. And this was my fault but, because I'm an introvert and thought being friends with this group was more comfortable than being more social, I barely had other friends. My other good friends are either a grade above me (who graduated) or a grade below. I'm okay with this at first, and I love my friends, but I've also come to realize I need friends from my grade because there are lots of mandatory social events at my school that'd be miserable if I attend alone (you'd know this if you go to a boarding school lol).
However, most of my peers by this time have already been so close with their friend groups that it was really hard for me to join any of them (and also because I'm quite introverted, I find it scary to go make friends with people when they're in a big group). For example, I'm good friend with this boy at my lab class (I'm a girl btw) and his friend group is nice, too, I know a couple of them and they're kind ppl; but being a girl in a guys' group is lwk intimidating to me. Of course, I have other female friends, and they talk to me kindly when we're alone, but once one member of their main friend group joins, they would just leave me aside (like completely), and i know I can still try and join their conversation, but I'm scared they'd find me annoying if I do.
So what should I do? I really don't want my last year at hs to be miserable.